package com.lbc.lock;

import java.util.concurrent.TimeUnit;

public class DeadLockDemo {
    /**
     *   死锁排查：
     *   1、使用 jps -l 定位进程号
     *   2、使用 jstack 进程号 找到死锁问题
     *
     *   面试/工作中 排查问题
     *   1、看日志
     *   2、看堆栈信息
     */
    public static void main(String[] args) {

        String lockA = "lockA";
        String lockB = "lockB";

        new Thread(new MyThread(lockA,lockB),"T1").start();
        new Thread(new MyThread(lockB,lockA),"T2").start();
    }
}

class MyThread implements Runnable {

    private String lockA;
    private String lockB;

    public MyThread(String lockA, String lockB) {
        this.lockA = lockA;
        this.lockB = lockB;
    }

    @Override
    public void run() {
        synchronized (lockA) {
            System.out.println(Thread.currentThread().getName()+"lock:"+lockA+"=>get"+lockB);

            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            synchronized (lockB) {
                System.out.println(Thread.currentThread().getName()+"lock:"+lockB+"=>get"+lockA);
            }

        }
    }
}
